Chuck



April 3, 1945. A. M STONER 2,372,691

CHUCK Filed May '21 1943 I '67..1 @V/.M i

ATTORNEY Patented pr. 3, 1945 UNlTEosTATEs PATENT oFF-rca assigner to The .Jacobs Manufacturing `{Gom- -.pany, Hartford, Donn., a corporation of C on- .Application May :21, 1943, Serial No. l187 ,885 7 claims. totem-68) 'This application *relates fto fa ynovel chuck and its object is to lprovide a construction wh'ereby the-size cfa chuckpf-thetypewhereintwo clamping Ijaws areactuatedbyffa 'Irightiand lef-t 'hand threaded screw may lbe reduced Iwithout vSaur-iho- Iin'g its strength and gripping Ipower and thus reduce its -weight vand 'the cost of `1`produc'tion.- In a copending application, "Serial No; `4\'l8639,@Filed -March 10, '1943, I lhave tshown a ohuck of the laforesaid'typein'whichItheactuatingscrewpasses through and lis surrounded by Ipartsfoftht-z clamping jaws and has fcertain other improved `characteristics. I fhave `found thatlsu'ch Ea chuck can be further improved #by making fthe clamping .jaws in the 'novel mannerdisolosed #herein Jand the present invention relates specifically 'to this new construction `and `arr-angement of `o'lan'rping jaws'and the lpartsfasseciatedithereii/ith.

Referring tothe ldrawing:

Figure 1 is a ceritral vsection'zall sidelelevationf'of a chuck which is'fmadelaccording to and embodies this invention together 4with the-*spindle 4rif *afmachine tool on which Sit is fmounted. l

Fig. 2 isarear end lelevation of thechuckshown 25 in Fig. 1 vwith the spindlefomitted;

Fig. 3 is a view similar to t'hatishownlin Fig. '1 without the spindle but taken atright 'angles to thelatter gure. y Fig. '4 is a sectional end view iof'the parts shown in Fig. 3, "the section being taken on'ftheline'l-- of the Vlatter figure. L Figs. '5, 6 and 7 arerespeotlively `a 'sidee'lfevation, a rear end elevation andV another side elevation of one of the clamping giaws. 'The views shown 'in Figures 6 and `7 .are -taken in 'the directions of the-arrows '.6 and .1 oFigj. ,y

Figs. 8, 9 and wareYrespective]ya .side .elevation, a .rjear elevation .and anothelzside elevation yof the other clamping jaw. The .viewsshownin Figs. 9 and .l0-are taken ,linthefdirections of @the arrows .9 and l in,^Fig.-8. f

Fig. .l1 .is an .elevation .of Van radjusting screw forfactuating.the-clampingjaws. l y Y Fig. 1,2 is fa side :elevation .of ,-a iooliingplate.` 20 designates a :cylindrical i chuck bolzlyv through which is a transverse rectangular 'passage ror guide 2`|. '-22 isanaiiialb'or'e through the front end of the body into the guide 2|.` 23 is van axial bore through the rear end of the body into the guide. A transverse slot 24 is cut through the approximate center of the rear end of the body into the guide 2l at right angles to the guide. 25 is a boss of reduced diameter formed in the rear end of the body 'and 26 is a shoulder at fthe base lci? the boss fa #d fat fright angles Ato the axis-of th-ebody. y

is :an 'adapter which -for-msa continuation of the 'body 20. In the partioularlform shown, the adapter rhas an internally threaded laxial `bore 3| ^to receive 'the'threadedend 31 of ya `spindle' 36 of a machine tool. 'The f-rontendlo'f 'the adapter fis turned .to form a hat surface 32 land an `internal cylindrical 'ii'ange f33 which Vare 2adapted to form a close t with the boss 2-5l'andthe` shoulder ,26 ron Athe rear `:end of tfhe -ohuc'k body. The adapter is secured toithe'bcdyby screws 34. y 4U vis an kadjusting screw Afor actuating tjhe clamping jaws. This screw has Ela ltransverse groove 4I intermediate its.V ends with annular flanges '42, 442 l on either side thereof and threaded portions 43, i434. :The threads v113 'are vleft hand hole' :in .one end vof the @screw for the reception of fa. wrench.

ntill-is lone of .La pairsof :clamping Jaws. "This, vas shown'in .detail in Figs. f517 iha'sa'fbody T5 l ithrough which 'is an internally threadedfbore 52 of left hand pitch :adapted lto fit the threads 43 of the screw 1'40. "Iwo :at inwardly converging Vsurfaces 5'3, .'54 are 2formed in the lbody at `one l"side of the bore ,52 beyond 'which is a 'flat sided eX- tension -56. The r-out'er surface ofthe `extension and the adjacent portion of the body -fin which Yis the bore 52 fare Aiiush but ythe opposite side 'of the body is 'cutback as rat 511 for the fpurposeof this invention. This rextension l56 is yadapted 'to overlie a cutback portion 6i! fof/the other clamping jawfas shown in Figs. 8-.1-0.

The other clamping 'jaw $0 -(Figs`. A-8-410) has a body 61 through which iscan internally threaded bore 162 of-right rhand pitch Aadapted to t the threads .44 of the Aadjusting fscrew. Two flat sided surfaces 63, 64 at onefsidefothelbore converge 'toward an edge '65. Beyond fthesurfaces 63, Mis aflat 'sided extension 5616iwhichis ada-pt-` ed tooverliethe `cut-ba'clcportion 57| of the lclamping jaw` shownin Figs. 'El-"7. ."The-sideiof the body opposite the extension is` cut "back, as at 61, `to clear `the extension '56 of the fotherlclamping aw.

11.0 (fFig. d'2) is one of a Lpair of like centering plates. "Theseare preferably of'fhardened-steel of a thickness approximately the same as the width of the slot 24. A semi-circular opening H is formed in the inner edge of each plate. l2 is a shoulder, the purpose of which will be pointed out later. The rear edge of each plate is cut back as at 13. The front edge of the plate is designated by the numeral 14.

The parts thus described are assembled in the following manner: the adjusting screw 40 is placed in the guide and moved to the rear end thereof. Then the centering plates 'l0 are inserted in the slot 24 in the chuck body and the slot 4i in the screw with the semi-circular parts 'il of the plates together encircling the reduced portion of the screw between the anges 12. Then the screw and the centering plates are moved forwardly to the position in which they are shown in Fig.\1 with the front of the shoulder 12 of the centering plates forward of and beyond the bottom of the slot 24 so that they cannot move transversely. With the screw in this position the clamping jaws are placed in the guide 2l and moved toward each other by rotating the screw.

The boss 25 may be formed while the chuck body is affixed to a centering spindle by the clamping jaws assembled in it in accordance withv the invention disclosed in the aforesaid applica tion. Then the adapter is applied to the chuck body and secured thereto by the screws 34. Thereafter the whole structure may be supported on a spindle 36 and its outer surface ground.

In Figs. 1 and 3 a tool 80 is shown inserted in the chuck and engaged by its clamping jaws. From these gures it may be seen that the insertion of the tool is limited by the engagement of its inner end with the forward edges T4 of the locking plates.

Structural modifications may be made within the spirit and scope of this invention and I intend no limitations other than those imposed by the following claims.

What I claim is:

1. A chuck comprising a body having a trans verse guide therein, a pair of right and left hand threaded clamping members slidably mounted in the guide, each of said members having a part adapted to engage an article and a portion of substantially the same depth as that of said part extending from one side of its article engaging part and in alinement therewith, overlapping the article engaging part f the other clamping member, a screwhaving right and left hand threads with its axis intersecting the normal'to that of an engaged article, and means for preventing longitudinal movement of the screw.

2. A chuck comprising a body having a transverse guide therein, a pair'of clamping jaws in the guide, said jaws having threaded bores and clamping surfaces offsetfrom the bores, each jaw having an extension from one side of its clamping surface and being formed on the other side of its clamping surface to receive the extension of the other jaw, a screw having right and left hand threads passing through the bores in the clamping jaws and engaging the threads therein, and means for preventing longitudinal movement of the screw.

3. A chuck comprising a body having a transverse guide therein, a pair of clamping jaws in the guide, said jaws having threaded bores of different pitch and inclined clamping surfaces arranged to make three line contacts with an en-y gaged article, said surfaces being offsetfrom the bores, each jaw havingan extension from one side of its clamping surface and being formed on the other side of its clamping surface to receive the extension of the other jaw, a screw having verse guide therein, a slot cut through one end of the body extending into the guide at right ,angles to the guide, a pair of internally threaded members in the guide, each of said members having a part adapted to engage an article and a portion extending from one side of its article engagingpart and overlapping the article engaging part of the other member, a screw having right and leftl hand threads surrounded by the members and a transverse groove intermediate its ends, and a locking plate in the slot in the body extending into the groove in the screw.

5. A chuck comprising a body having a transverse guide therein, a slot cut through one end of the body extending into the guide at right angles to the guide, a pair of internally threaded clamping jaws in the guide, said jaws having overlapping portions, a screw having right and left hand threads surrounded by the clamping jaws and a transverse groove intermediate its ends and a pair of locking plates in the slot in the body extending into the groove in the screw.

6. A chuck comprising a body having a transverse guide therein, a slot cut through one end of the body extending into the guide at right angles to the guide, a pair of clamping jaws in the guide, said jaws having threaded bores and clamping surfaces offset from the bores, each jaw having an extension from one side of its clamping surfaces and being formed on the other side of its clamping surfaces to receive the extension of the other jaw, a screw having right and left hand threads passing through the bores in the clamping jaws and engaging the threads therein and a transverse groove-intermediate its ends, a pair of locking plates in the slot in the body extending into the groove in the screw, said plates having abutting edges -provided with recesses in alinement with the groove in the screw.

7. A chuck comprising a body having a transverse guide therein, a slot cut through one end of the body extending into the guide at right angles to the guide, a pair of clamping jaws in the guide, said jaws having threaded bores of different pitch and inclined clamping surfaces arranged to make three line contacts with an engaged article, said surfaces being offset from the bores, each jaw having an extension from one side of its clamping surfaces and being formed on the other side of its clamping surfaces to receive the extension of the other jaw, a screw having right and left hand threads of different pitch passing through the bores in the clamping jaws and engaging the threads therein, and a pair of locking plates in the slot'l in the body extending into the groove in the screw, said plates having abutting edges provided with recesses in alinement with the groove in the screw, the for- Ward edges of said plates extending beyond the threads of the screw.

AR'IHUR. MERRICK STONER. 

